I am displaying a data table in a datagridview. I have two fields, 'key' and some 'text'.
The 'key' field visiblity is turned off.
When I display the form it displays only the 'text' column (as I expect).
But if I close the form and reopen it the datagridview now displays the 'key' and the 'text' columns.

Any suggestions why this occurs?

Sorry, not sure if this should be posted under database forum.